Winding machine for magnetic cores of small size



y 12, 1964 SHINTARO OSHIMA 3,132,816

WINDING MACHINE FOR MAGNETIC CORES OF SMALL SIZE Filed Aug. 29, 1960 4 Sheets-Shet 1 Fig 14/ PRIOR/4R7 May 1964 SHINTARO OSHIMA 3,132

WINDING MACHINE FOR MAGNETIC CORES OF SMALL SIZE Filed Aug. 29, 1960 4 Sheets-Sheet 2 May 1954 SHINTARO OSH'IMA 3,132,816

WINDING MACHINE FOR MAGNETIC CORES OF SMALL SIZE Filed Aug. 29, 1960 4 Sheets-Sheet 3 Fig", 64,

May 12, 19-64 SHINTARO OSHIMA WINDING MACHINE FOR MAGNETIC CORES OF SMALL SIZE Filed Aug. 29, 1960 4 Sheets-Sheet 4 United States Patent 3,132,816 WINDING MACHENE FOR MAGNETIC QQRES OF SMALL SEE Shiniare Oshinia, Tohyodo, Japan, assignor to Kokusai Denshin Denwa Kahushiiti Keisha, Tokyo-to, Japan, a

joint-stock company of Japan i -fled Aug. 29, 19%,Ser. No. 52,543 9 Claims. (Cl. 24 2-4) This invention relates to a winding machine for magnetic cores of very small size.

In manufacturing parametrons which have become widely used in electronic computers and the like, it is necessary to provide electric winding around an annular magnetic core of small size; Heretofore, coils of an annular magnetic core have been wound by interlinking an annular spool supporting a wire of required length with an annular magnetic core and by relatively rotating said spool and core. Therefore, the internal diameter of the core has had to be large enough to receive the spool with substantial space therebetween, and magnetic cores smaller than said limit could not be Wound. Furthermore, the operation and manipulation of the winding machine have been very dilficult and complicated.

The object of this invention is to obviate such disadvantages and to provide a novel winding machine which can provide a Winding upon a magnetic core having a cross section nearly equal to that of a single wire. The invention will be more fully described hereunder with reference to the accompanying drawings, in which:

FIGS. 1(A) and (B) are schematic views showing the principle of a prior art winding machine;

FIG. 2 is a perspective view of the essential portions showing one embodiment of this invention;

FIG. 3 is a side elevational view of the machine shown in FIG. 2;

FIGS. 4(A), (B), (C) and (D) are views for explaining the operation of the machine illustrated in FIGS. 2 and 3;

FIG. 5 shows one mode of Winding in accordance with this invention;

FIG. 6 is a perspective view for showing an actual device for driving the belt of the machine of this invention;

FIG. 7 is a sectional view along the line VII-VII in FIG. 6;

FIG. 8 is a front view of another device for driving the belt of this invention;

FIG. 9 is a side view of another device for driving the belt of this invention;

FIG. 10 shows a plan view and sectional view along, the line '9', of an illustrative mechanism for driving the core to be wound with a wire,

FIG. 10a is another view of the device shown in FIG. 10 with the rollers shifted inwardly;

FIG. 11 is a side elevation of a loop with the core in cross-section showing second means for guiding an end of the wire.

In FIGS. 2-11, the same members are designated by the same numerals.

Referring to FIG. 1, an annular spool 2 supporting a wire 1 is interlinked with an annular magnetic core 3. In this state, if the spool and core are rotated relatively to each other, the wire, is Wound on the magnetic core 3. However, according to the coil winding system of FIG. 1, the disadvantage as already stated can not be avoided.

However, according to the present invention, said disadvantage can be effectively eliminated by the following embodiments of this invention.

The machine of FIGS. 2 and 3 comprises a pair of opposed endless belts 4, 4. These belts include loop sections which are maintained in direct contact with each other, with a wire 8 sandwiched between these sections,

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by the pressure imparted thereto by rollers 5, 5', 6 and 6, said loop sections being arranged to interlink with a magnetic core 9, and other loop sections of said belts being supported by driving rollers '7 and 7 and separated from each other to the leftand righthand sides of the rollers 5 and 5. The machine comprises, besides above mentioned funnel shaped members 16 and 10', a guide members 11 (FIG. 2) formed by a pair of plates in order to prevent wire 8 from tangling as it is moved from belts 4 and 4'.

In the operation of the Windingmachine constructed as above described according to this invention, while one end of the wire 8 having a required length obtained by cutting a continuous wire is fixed to the magnetic core 9 or to any suitable point, and the other end thereof is threaded through the members 9, 10, and 10 and sandwiched between the contacting sections of the belts 4 and 4'. Then the belts are driven to carry the Wire 8 with them. When one end of the Wire arrives at a point above the core 9, the belts 4 and 4' are separated toward left and right so that only the end portion of the wire will be inserted in the center opening of the core through the slitted guide member 10 and after passing through the core and lower slitted guide member HP will be sandwiched again between belts and continue its travel with belts until its end reaches again a point above the core. FIG. 4 shows steps of this winding process. FIG. 4(A) shows a state wherein the end of the wire has threaded through the center opening of the core and is again sandwiched between belts beneath the core. FIGS. 40?), (C) and (D) illustrate the manner in which the slack in the wire around the core is gradually tightened as the wire end is carried with the belts. If the length of loop section of the belt is selected to have equal length as that of the wire 8, one turn would be formed each time the-wire end arrives at a point above the core. Thus, by repeating this operation while rotating the core 9 at a required velocity around its center axis in such a conventional driving mechanism as in the known coil winding machine. For example, the core can be rotated by three driving rollers which are made to touch with peripheral surface of said core. However, it is preferable to use on mechanism such as shown in FIG. 10, in which an endless belt 17 having section as is clearly shown in the sectional View is driven by driving rollers 18 through guide rollers 19 and the core 9. According to adoption of the mechanism of FIG. 10, the core 9 can be effectively rotated by the driving belt 17.

When it is dimcult toprovide a winding on the desired position of the core due to residual strain of the wire tending to coil, a suitable guide member may be provided at the outside of the core. Further, instead of using funnel shaped guide rnembers 10 and it), the end of the wire can be accurately threaded through the central opening of the core by attaching a guiding needle 21 (FIG. 11) or the like made of rigid material to the leading end of the wire or by directing compressed air in the direction of threading of the wire.

In the above embodiment, the rollers 5, 5, 6 and 6 maybe driving rollers or the rollers 5 and 5' and rollers 6 and 6' may be, respectively, used as the guide rollers and driving rollers.

For driving the belts 4 and 4' the mechanism such as those shown in FIGS. 6 and 7 can be used, in which the same members as those of the embodiment of FIGS. 2 and 3 are designated by the same numerals, and in which the endless belts 4 and 4 are held in a circular slot formed by circular concave portion 15 and 15' of two symmetrical ring plates or circular plates 14 and 14' and are guided by the guide rollers 5, 5', 13 and '13. Three driving rollers 12, each provided with two parallel slots 16 therearound, are arranged around the plate 14 and 14' in equia distanced positions so that said slots engage, respectively, with the outer peripheries of said plates, whereby the positions of said rings for holding the belts 4 and 4 are secured. The driving rollers 12 are driven by a driving motor not shown or by hand through a gear train not shown.

In the embodiment of FIGS. 6 and 7, when the driving rollers 12 are driven in one direction, the plates 14 and 14' are rotated in the direction reverse to shaft of the driving rollers by the frictional force between said rollers and plates, whereby the belts 4 and 4 also are driven in the same direction as said plates. Accordingly, the wire 8 put in between the belts is driven in the same manner as the case of the embodiment of FIGS. 2 and 3.

For rotating the plates 14 and 14' and driving the belts 4 and 4' held by said plates, other devices such as those shown in FIGS. 8 and 9 may be used. In the case of FIG. 8, the plates 14, 14 are provided with gear teeth therearound and the pinions l2, 12 also are provided with gear teeth which are engaged with the teeth of the plates 14 and 14-. The manner of holding the belts 4 and 4' by the plates 14 and 14 is the same as in the case of FIGS. 7 and 6. In the case of FIG. 9, the above-mentioned plates 14 and 14' are formed as circular plates 14 and are provided, respectively, with the driving shafts 16. The manner of holding the belts 4 and by the plates 14 is the same as in the case of FIGS. 6 and 7.

As explained hereinabove, since the winding machine sidewardly for the mounting of another, new core. Without severing the wire, its end is threaded through the new core to continue winding operation, whereby a single wire is serially wound upon a plurality of cores as shown in FIG. 5. Thus, this winding machine can effect novel and useful winding operations which prior winding machines cannot provide.

While this invention has been shown and described with regard to particular embodiments, it will be understood that details of the machine can be varied without departing from the true spirit and scope of the invention.

What I claim is:

l. A winding machine for Winding a cut length of wire around an annular core having a center axis and a small center opening said machine comprising: a pair of endless belts arranged in face to face contact with each other and mounted for rotation around an axis of rotation, said belts for engaging said wire therebetween; means for pressing the facing portions of said endless belts firmly together to prevent slipping between said wire and said endless belts; guiding means for separating said facing belts for a relatively short distance; supporting means for supporting said annular core between the separated portions of said endless belts with said core center axis normal to said belts axis of rotation; means for rotating said core around said center axis and means for rotating said endless belts around said axis of rotation; wire guiding means for guiding and positioning the wire as it is carried between said separated portion of the endless belts and through said annular core; whereby when one end of said out length of wire is secured and the other free end inserted between said endless belts said wire is frictionally engaged and carried by said belt facing portions to be threaded and drawn through said small center opening thereby winding said wire around said core as said core and endless belts are rotated.

2. A winding machine according to claim 1 wherein said wire guiding means comprises funnel shaped guide members mounted above and beneath the annular core, each of said funnels being slitted for their full length for the passage of said wire therefrom as said coil is tightened.

3. A winding machine according to claim 1, wherein said wire guiding means comprises a small needle, stiffer than the wire to be wound, attached to the leading end of said wire, thereby facilitating the threading of said wire through the central opening of the circular core.

4. A winding machine according to claim 1 wherein means for rotating said core comprises an endless belt mounted partially around the periphery of said core, and a driving roller which is rotatably mounted in contact with said endless belt for driving said belt.

5. A winding machine according to claim 1, wherein said means for rotating said belts comprises two adjacent circular plates, said plates defining a pulley, having a circular slot therearound in which said belts are held, said belts being engaged in face to face contact for holding the wire therebetween.

6. A winding machine according to claim 5, wherein the circular plates are provided with driving rollers which rotate said plates.

7. A winding machine according to claim 5 wherein the circular plates are provided with gear teeth, and including driving gears engaging said teeth, whereby said plates are rotated together with the belts held therebetween.

8. A winding machine according to claim 5, wherein each of the circular plates is provided with a driving shaft, whereby said plates are rotated together with the belts held therebetween.

9. A winding machine according to claim 5, including at least one rotatably driven driving roller for rotatably driving said circular plates, said driving roller having two parallel, circumferential slots, said driving roller being disposed peripherally of said circular plates with a respective one of said plates engaged peripherally by a respective one of said slots for rotatably driving said circular'plates jointly.

References Cited in the file of this patent UNITED STATES PATENTS 545,674 Burns Sept. 3, 1895 2,102,692 Franz Dec. 21, 1937 FOREIGN PATENTS 523,338 Great Britain July 11, 1940 

1. A WINDING MACHINE FOR WINDING A CUT LENGTH OF WIRE AROUND AN ANNULAR CORE HAVING A CENTER AXIS AND A SMALL CENTER OPENING SAID MACHINE COMPRISING: A PAIR OF ENDLESS BELTS ARRANGED IN FACE TO FACE CONTACT WITH EACH OTHER AND MOUNTED FOR ROTATION AROUND AN AXIS OF ROTATION, SAID BELTS FOR ENGAGING SAID WIRE THEREBETWEEN; MEANS FOR PRESSING THE FACING PORTIONS OF SAID ENDLESS BELTS FIRMLY TOGETHER TO PREVENT SLIPPING BETWEEN SAID WIRE AND SAID ENDLESS BELTS; GUIDING MEANS FOR SEPARATING SAID FACING BELTS FOR A RELATIVELY SHORT DISTANCE; SUPPORTING MEANS FOR SUPPORTING SAID ANNULAR CORE BETWEEN THE SEPARATED PORTIONS OF SAID ENDLESS BELTS WITH SAID CORE CENTER AXIS NORMAL TO SAID BELTS'' AXIS OF ROTATION; MEANS FOR ROTATING SAID CORE AROUND SAID CENTER AXIS AND MEANS FOR ROTATING SAID ENDLESS BELTS AROUND SAID AXIS OF ROTATION; WIRE GUIDING MEANS FOR GUIDING AND POSITIONING THE WIRE AS IT IS CARRIED BETWEEN SAID SEPARATED PORTION OF THE ENDLESS BELTS AND THROUGH SAID ANNULAR CORE; WHEREBY WHEN ONE END OF SAID CUT LENGTH OF WIRE IS SECURED AND THE OTHER FREE END INSERTED BETWEEN SAID ENDLESS BELTS SAID WIRE IS FRICTIONALLY ENGAGED AND CARRIED BY SAID BELT FACING PORTIONS TO BE THREADED AND DRAWN THROUGH SAID SMALL CENTER OPENING THEREBY WINDING SAID WIRE AROUND SAID CORE AS SAID CORE AND ENDLESS BELTS ARE ROTATED. 